linux.git/include/linux/virtio.h, branch v6.14-rc2

virtio_pci: Add support for PCIe Function Level Reset

2025-01-27T14:39:26+00:00

Implement support for Function Level Reset (FLR) in virtio_pci devices.
This change adds reset_prepare and reset_done callbacks, allowing
drivers to properly handle FLR operations.

Without this patch, performing and recovering from an FLR is not possible
for virtio_pci devices. This implementation ensures proper FLR handling
and recovery for both physical and virtual functions.

The device reset can be triggered in case of error or manually via
sysfs:
echo 1 > /sys/bus/pci/devices/$PCI_ADDR/reset

Signed-off-by: Israel Rukshin 
Reviewed-by: Max Gurtovoy 
Message-Id: <1732690652-3065-2-git-send-email-israelr@nvidia.com>
Signed-off-by: Michael S. Tsirkin

virtio_ring: add a func argument 'recycle_done' to virtqueue_reset()

2024-12-10T10:22:21+00:00

When virtqueue_reset() has actually recycled all unused buffers,
additional work may be required in some cases. Relying solely on its
return status is fragile, so introduce a new function argument
'recycle_done', which is invoked when it really occurs.

Signed-off-by: Koichiro Den 
Acked-by: Jason Wang 
Reviewed-by: Xuan Zhuo 
Signed-off-by: Paolo Abeni

virtio_ring: add a func argument 'recycle_done' to virtqueue_resize()

2024-12-10T10:22:21+00:00

When virtqueue_resize() has actually recycled all unused buffers,
additional work may be required in some cases. Relying solely on its
return status is fragile, so introduce a new function argument
'recycle_done', which is invoked when the recycle really occurs.

Cc:  # v6.11+
Signed-off-by: Koichiro Den 
Acked-by: Jason Wang 
Reviewed-by: Xuan Zhuo 
Signed-off-by: Paolo Abeni

Merge tag 'vfio-v6.13-rc1' of https://github.com/awilliam/linux-vfio

2024-11-27T20:57:03+00:00

Pull VFIO updates from Alex Williamson:

 - Constify an unmodified structure used in linking vfio and kvm
   (Christophe JAILLET)

 - Add ID for an additional hardware SKU supported by the nvgrace-gpu
   vfio-pci variant driver (Ankit Agrawal)

 - Fix incorrect signed cast in QAT vfio-pci variant driver, negating
   test in check_add_overflow(), though still caught by later tests
   (Giovanni Cabiddu)

 - Additional debugfs attributes exposed in hisi_acc vfio-pci variant
   driver for migration debugging (Longfang Liu)

 - Migration support is added to the virtio vfio-pci variant driver,
   becoming the primary feature of the driver while retaining emulation
   of virtio legacy support as a secondary option (Yishai Hadas)

 - Fixes to a few unwind flows in the mlx5 vfio-pci driver discovered
   through reviews of the virtio variant driver (Yishai Hadas)

 - Fix an unlikely issue where a PCI device exposed to userspace with an
   unknown capability at the base of the extended capability chain can
   overflow an array index (Avihai Horon)

* tag 'vfio-v6.13-rc1' of https://github.com/awilliam/linux-vfio:
  vfio/pci: Properly hide first-in-list PCIe extended capability
  vfio/mlx5: Fix unwind flows in mlx5vf_pci_save/resume_device_data()
  vfio/mlx5: Fix an unwind issue in mlx5vf_add_migration_pages()
  vfio/virtio: Enable live migration once VIRTIO_PCI was configured
  vfio/virtio: Add PRE_COPY support for live migration
  vfio/virtio: Add support for the basic live migration functionality
  virtio-pci: Introduce APIs to execute device parts admin commands
  virtio: Manage device and driver capabilities via the admin commands
  virtio: Extend the admin command to include the result size
  virtio_pci: Introduce device parts access commands
  Documentation: add debugfs description for hisi migration
  hisi_acc_vfio_pci: register debugfs for hisilicon migration driver
  hisi_acc_vfio_pci: create subfunction for data reading
  hisi_acc_vfio_pci: extract public functions for container_of
  vfio/qat: fix overflow check in qat_vf_resume_write()
  vfio/nvgrace-gpu: Add a new GH200 SKU to the devid table
  kvm/vfio: Constify struct kvm_device_ops

virtio_ring: remove API virtqueue_set_dma_premapped

2024-11-16T02:46:55+00:00

Now, this API is useless. remove it.

Signed-off-by: Xuan Zhuo 
Acked-by: Jason Wang 
Link: https://patch.msgid.link/20241112012928.102478-8-xuanzhuo@linux.alibaba.com
Signed-off-by: Jakub Kicinski

virtio_ring: introduce add api for premapped

2024-11-16T02:46:55+00:00

Two APIs are introduced to submit premapped per-buffers.

int virtqueue_add_inbuf_premapped(struct virtqueue *vq,
                                 struct scatterlist *sg, unsigned int num,
                                 void *data,
                                 void *ctx,
                                 gfp_t gfp);

int virtqueue_add_outbuf_premapped(struct virtqueue *vq,
                                  struct scatterlist *sg, unsigned int num,
                                  void *data,
                                  gfp_t gfp);

Signed-off-by: Xuan Zhuo 
Acked-by: Jason Wang 
Link: https://patch.msgid.link/20241112012928.102478-6-xuanzhuo@linux.alibaba.com
Signed-off-by: Jakub Kicinski

virtio: Extend the admin command to include the result size

2024-11-13T22:25:41+00:00

Extend the admin command by incorporating a result size field.

This allows higher layers to determine the actual result size from the
backend when this information is not included in the result_sg.

The additional information introduced here will be used in subsequent
patches of this series.

Acked-by: Michael S. Tsirkin 
Signed-off-by: Yishai Hadas 
Link: https://lore.kernel.org/r/20241113115200.209269-3-yishaih@nvidia.com
Signed-off-by: Alex Williamson

virtio: allow driver to disable the configure change notification

2024-08-16T02:14:19+00:00

Sometime, it would be useful to disable the configure change
notification from the driver. So this patch allows this by introducing
a variable config_change_driver_disabled and only allow the configure
change notification callback to be triggered when it is allowed by
both the virtio core and the driver. It is set to false by default to
hold the current semantic so we don't need to change any drivers.

The first user for this would be virtio-net.

Cc: Venkat Venkatsubra 
Cc: Gia-Khanh Nguyen 
Acked-by: Michael S. Tsirkin 
Signed-off-by: Jason Wang 
Link: https://patch.msgid.link/20240814052228.4654-3-jasowang@redhat.com
Signed-off-by: Jakub Kicinski

virtio: rename virtio_config_enabled to virtio_config_core_enabled

2024-08-16T02:14:19+00:00

Following patch will allow the config interrupt to be disabled by a
specific driver via another boolean. So this patch renames
virtio_config_enabled and relevant helpers to
virtio_config_core_enabled.

Cc: Venkat Venkatsubra 
Cc: Gia-Khanh Nguyen 
Acked-by: Michael S. Tsirkin 
Signed-off-by: Jason Wang 
Link: https://patch.msgid.link/20240814052228.4654-2-jasowang@redhat.com
Signed-off-by: Jakub Kicinski

Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

2024-07-29T19:53:37+00:00

Pull virtio fixes from Michael Tsirkin:
 "The biggest thing here is the adminq change - but it looks like the
  only way to avoid headq blocking causing indefinite stalls.

  This fixes three issues:

   - Prevent admin commands on one VF blocking another.

     This prevents a bad VF from blocking a good one, as well as fixing
     a scalability issue with large # of VFs

   - Correctly return error on command failure on octeon. We used to
     treat failed commands as a success.

   - Fix modpost warning when building virtio_dma_buf. Harmless, but the
     fix is trivial"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  virtio_pci_modern: remove admin queue serialization lock
  virtio_pci_modern: use completion instead of busy loop to wait on admin cmd result
  virtio_pci_modern: pass cmd as an identification token
  virtio_pci_modern: create admin queue of queried size
  virtio: create admin queues alongside other virtqueues
  virtio_pci: pass vq info as an argument to vp_setup_vq()
  virtio: push out code to vp_avq_index()
  virtio_pci_modern: treat vp_dev->admin_vq.info.vq pointer as static
  virtio_pci: introduce vector allocation fallback for slow path virtqueues
  virtio_pci: pass vector policy enum to vp_find_one_vq_msix()
  virtio_pci: pass vector policy enum to vp_find_vqs_msix()
  virtio_pci: simplify vp_request_msix_vectors() call a bit
  virtio_pci: push out single vq find code to vp_find_one_vq_msix()
  vdpa/octeon_ep: Fix error code in octep_process_mbox()
  virtio: add missing MODULE_DESCRIPTION() macro